/Engine/Plugins/Runtime/OpenXR/Source/OpenXRHMD/Public/IOpenXRARModule.h
void SetTrackingSystem ( [TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< class [FXRTrackingSystemBase](API\Plugins\XRBase\FXRTrackingSystemBase), ESPMode::ThreadSafe > InTrackingSystem )